In the modern food packaging industry, preservation requirements are becoming increasingly stringent. Products must retain their flavor, color, and nutritional value over extended periods. This is why multilayer packaging was developed. Among the materials used, EVOH is considered a key component. Although thin, it plays a decisive role in preservation performance.
So, what is EVOH and why is it widely used? The article below will help you understand the nature and applications of this material.
OVERVIEW
EVOH is a polymer with excellent gas barrier properties. Its full name is Ethylene Vinyl Alcohol. This material is commonly used in multilayer packaging structures. Unlike conventional plastics, EVOH provides outstanding oxygen barrier performance. This helps limit food oxidation. When oxygen is blocked, food quality is preserved for a longer time.
However, EVOH is not used alone. It is typically combined with other plastic layers such as PE or PP. This combination leverages the advantages of each material. Thanks to the multilayer structure, the packaging achieves both mechanical strength and high protection performance. EVOH serves as the critical “barrier layer” in this system.
MULTILAYER PACKAGING STRUCTURE WITH EVOH
Multilayer packaging is designed to meet multiple requirements simultaneously. Each layer performs a specific function. EVOH is usually positioned in the middle layer.
The outer layer provides mechanical protection and moisture resistance. The inner layer comes into direct contact with food. EVOH, located in between, prevents gas penetration. With this structure, the packaging can protect products comprehensively. It not only blocks oxygen but also limits odors and gases from the external environment.
This combination optimizes performance while saving material. That is why multilayer packaging is becoming increasingly popular.
ROLE OF EVOH IN FOOD PACKAGING
Superior oxygen barrier performance
Oxygen is the main cause of food spoilage. It accelerates fat oxidation and leads to color degradation. When EVOH blocks oxygen, the rate of deterioration is significantly reduced. This is particularly important for products such as meat, dairy, and processed foods. Thanks to EVOH, shelf life can be significantly extended.
Maintaining flavor and product quality
In addition to blocking oxygen, EVOH helps preserve natural flavors. Without gas intrusion, taste and aroma remain stable. This is especially important for premium food products, where consumers demand consistent quality.
EVOH minimizes flavor loss and prevents external odors from penetrating. As a result, products retain their original characteristics, enhancing their market value.
Extending shelf life
Shelf life is a key factor in the food industry. Packaging containing EVOH helps extend storage time without the need for preservatives. When the internal environment is controlled, microbial growth slows down, reducing the risk of spoilage.
This role becomes even more critical in long supply chains. Products can be transported over long distances while still maintaining quality.
DISADVANTAGES
Despite its many advantages, EVOH is affected by environmental conditions. Humidity is the most critical factor. When exposed to high humidity, the gas barrier performance of EVOH decreases. Therefore, it must be protected by other plastic layers.
Additionally, the thickness of the EVOH layer affects performance. The thicker the layer, the better the barrier properties—but at a higher cost. The manufacturing process also plays an important role. If the layer is not evenly distributed, the protective performance will be reduced. Therefore, packaging structure design must be carefully considered.
APPLICATIONS
EVOH is widely used in various types of packaging. One of the most common applications is in packaging for meat and fresh food. It is also used in dairy and beverage packaging, where high preservation performance is required.
EVOH is also applied in ready-to-eat food packaging, which requires extended shelf life. In the beverage industry, EVOH helps prevent CO₂ from escaping, maintaining carbonation stability.
TRENDS
The packaging industry is moving toward sustainability, and EVOH is part of this trend. Research is focusing on reducing material usage while maintaining performance. In addition, recyclability is receiving increasing attention.
Some new solutions combine EVOH with environmentally friendly materials, helping reduce environmental impact. In the future, EVOH will continue to play a key role, serving as a bridge between preservation efficiency and sustainability requirements.
CONCLUSION
EVOH is an essential material in multilayer food packaging. It helps block gases, maintain quality, and extend shelf life. With its excellent oxygen barrier properties, EVOH has become a preferred choice in many applications. However, to achieve optimal performance, proper packaging structure design is required.
As the food industry continues to evolve, the role of EVOH will become increasingly significant. It is a solution that balances quality and economic efficiency. Understanding and applying EVOH correctly will help businesses enhance product value while meeting growing market demands.
VICHEM – AUTHORIZED DISTRIBUTOR OF CHEMICAL ADDITIVES FOR THE ADHESIVE INDUSTRY SUCH AS PVA, VAE, EVOH,… FROM SINOPEC IN VIETNAM
Vichem is an authorized distributor of chemical additives for the adhesive industry such as PVA, VAE, and EVOH from Sinopec in the Vietnamese market. We not only provide high-quality products but also deliver after-sales services that meet international standards.
For more information about our products, please contact us via the following channels:
📞 Hotline: 08 1790 1790
📧 Email: contact@vichem.vn
🔎 LinkedIn: Vichem JSC
🌐 Website: www.vichem.vn
📌 Facebook: Vichem JSC
